drm/i915: Add rotation readout for plane initial config
If we need to force a full plane update before userspace/fbdev have given us a proper plane state we should try to maintain the current plane state as much as possible (apart from the parts of the state we're trying to fix up with the plane update). To that end add basic readout for the plane rotation and maintain it during the initial fb takeover. Cc: Hans de Goede <hdegoede@redhat.com> Fixes: 516a49cc ("drm/i915: Fix assert_plane() warning on bootup with external display") Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181120135450.3634-2-ville.syrjala@linux.intel.comTested-by: NHans de Goede <hdegoede@redhat.com> Reviewed-by: NRodrigo Vivi <rodrigo.vivi@intel.com> Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com> (cherry picked from commit f43348a3) Signed-off-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
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